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EP2136465B1 - Onduleur realisé par un pont comportant des commutateurs synchronisant lentement et rapidement - Google Patents

Onduleur realisé par un pont comportant des commutateurs synchronisant lentement et rapidement Download PDF

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Publication number
EP2136465B1
EP2136465B1 EP08011019.0A EP08011019A EP2136465B1 EP 2136465 B1 EP2136465 B1 EP 2136465B1 EP 08011019 A EP08011019 A EP 08011019A EP 2136465 B1 EP2136465 B1 EP 2136465B1
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EP
European Patent Office
Prior art keywords
switches
inverter
clocked
fast
slow
Prior art date
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EP08011019.0A
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German (de)
English (en)
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EP2136465A1 (fr
Inventor
Jens Friebe
Regine Dr.-Ing. Mallwitz
Peter Prof. Dr.-Ing. Zacharias
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SMA Solar Technology AG
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SMA Solar Technology AG
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Priority to EP08011019.0A priority Critical patent/EP2136465B1/fr
Priority to US12/477,948 priority patent/US8094475B2/en
Priority to KR1020090052647A priority patent/KR101123431B1/ko
Publication of EP2136465A1 publication Critical patent/EP2136465A1/fr
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
    • H01L2224/06—Structure, shape, material or disposition of the bonding areas prior to the connecting process of a plurality of bonding areas
    • H01L2224/0601—Structure
    • H01L2224/0603—Bonding areas having different sizes, e.g. different heights or widths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
    • H01L2224/491—Disposition
    • H01L2224/4911—Disposition the connectors being bonded to at least one common bonding area, e.g. daisy chain
    • H01L2224/49111—Disposition the connectors being bonded to at least one common bonding area, e.g. daisy chain the connectors connecting two common bonding areas, e.g. Litz or braid wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/13—Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304—Transistor
    • H01L2924/1305—Bipolar Junction Transistor [BJT]
    • H01L2924/13055—Insulated gate bipolar transistor [IGBT]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/13—Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304—Transistor
    • H01L2924/1306—Field-effect transistor [FET]
    • H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
    • H01L2924/191—Disposition
    • H01L2924/19101—Disposition of discrete passive components
    • H01L2924/19107—Disposition of discrete passive components off-chip wires
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/5388—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with asymmetrical configuration of switches
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the invention relates to an inverter for feeding a power of a DC voltage source, in particular a photovoltaic generator in an AC voltage network, with an asymmetrically clocked bridge circuit with at least two switched at mains frequency first switches and at least two clocked at a higher clock frequency second switches.
  • Inverters are known in full bridge circuit. These can be designed as single or three-phase full bridges for feeding into a power grid. Each bridge branch consists of two switches in the case of single-phase infeed. Each AC line contains a mains choke. The switches of the bridge circuit can be switched symmetrically or asymmetrically in principle.
  • a bridge branch consists of four switches.
  • the two middle switches are freewheeled by two in series Diodes bridged.
  • This circuit has the advantage that the voltage load on the active switches is reduced.
  • Inverters of this type are usually used switches such as IGBTs or MOSFETs.
  • a switch combination consisting of a SiC JFET and a Si low voltage MOSFET is shown.
  • This switch combination is designed as a four-terminal device, namely two drain, one gate, and one source.
  • JFET and MOSFET switch types
  • MOSFET complementary metal-oxide-semiconductor
  • the JP 2005 05 1926 A describes different types of switches namely n-channel-type MOSFET 7U and p-channel-type MOSFET 8U. However, these switches are MOSFETs and have the same temperature resistance. They differ only in the doping (p-type, n-type).
  • the DE 10 2004 063 277 A1 explains a problem regarding parasitic inductances. Namely, a semiconductor device with integrated support capacity is to be created or fluctuations in a supply voltage should be avoided or the case of a breakdown of these capacities should be treated.
  • the invention has the object to improve the efficiency of an inverter of the type mentioned at low cost.
  • This object is achieved in that for the network frequency slowly switching switches of the same temperature resistance are used, that are used for the higher clock frequency fast switching switch with steeper switching edges and higher temperature resistance, wherein the fast switching switch arranged spatially separated from the slow switching switch in that at least one additional support capacitor is connected close to the fast switching switches, that the slow switching switches are arranged in a first group of components, while the fast switching switches are arranged in a second group of components spatially separated, the first group of components on a first substrate and the second component group is disposed on a second substrate.
  • the inverter according to the invention is for feeding active power into an electrical energy supply network from a DC source, for. B. from photovoltaic modules or fuel cells, using different fast switching components very suitable.
  • the invention is based on the recognition that in the course of device development with significantly faster switching switches but also higher permissible operating temperatures for these switches is to be expected. As a result, significant increases in efficiency are expected.
  • Components of silicon (Si) such as Si-IGBTs or Si-MOSFETs, and in particular silicon carbide (SiC) components, are particularly affected by this development.
  • switches of different development generations are used in a circuit, which are characterized by different levels of temperature resistance, this will be in the spatial arrangement considered. Only a spatial separation can exploit the advantages of a higher permissible operating temperature at all. At the same time, the requirement for a low parasitic inductance is taken into account. The parasitic inductance is the smaller, the shorter the supply lines between the switching components. The spatial separation of the different switches allows asymmetric clocking short supply lines for the commutation.
  • the object is thus practically achieved in that the Kommut istsnike be constructed with equal fast switching switches same temperature resistance. This is especially possible if the circuit is clocked asymmetrically.
  • the fast-switching switches of equal and high temperature resistance are arranged spatially separated from the slow-switching switches lower temperature resistance. This can actually ensure a higher operating temperature for the fast switches. The advantage of the higher operating temperature can thus be utilized. It takes less effort to dissipate the heat generated.
  • the switches involved in the commutation processes can in turn be arranged close to each other spatially, whereby the parasitic inductance in the commutation circuit is limited to minimum values.
  • the invention also EMC problems can be minimized, through the use of the switch characteristics and the inventive electrical connection of the components.
  • the slow-switching switches are arranged in a first component group, while the fast-switching switches are arranged spatially separated in a second component group.
  • the faster switching and more temperature resistant switches thus form a first group of components.
  • the slower-switching and less temperature-resistant switches form a second group of components. Both modules are set apart from each other. This assignment allows both a good thermal separation and a low parasitic inductance in Kommut réellesnik.
  • the invention is also characterized in that at least one additional backup capacitor is connected close to the fast-switching switches.
  • the backup capacitor is present in the first group of components of the fast switches. This additionally limits the voltage across the fast-switching switches.
  • switches are integrated in mounting modules, wherein preferably the switches are designed as chips within a module.
  • the structure in a mounting module with at least two substrates minimizes parasitic inductances, wherein the first component group on the first substrate and the second component group are arranged on the second substrate.
  • a particularly low parasitic inductance is achieved because the circuit arrangement is integrated in a mounting module, since the switches are arranged as chips within such a module very close to each other and thereby conductor tracks and bonding wires can be kept very short.
  • each switch ie chip, is packaged separately. This means that inside the housing there are conductor tracks and bonding wires, and outside the housing or the housing there are further tracks on an external circuit board, for example.
  • the inverter in each case different heat sinks or thermally separated mounting surfaces are provided for the fast-switching switches and the slow-switching switch, on which the switches are mounted.
  • the construction with discrete components is carried out in particular on two heat sinks, wherein the first assembly on the first heat sink and the second assembly are arranged on the second heat sink.
  • switches with low temperature resistance or low temperature limits can be used, without the need for oversized heat sinks.
  • the heat sinks can be optimally adapted to the switches. Through these switches and the separate heat sink high efficiency can be achieved despite small dimensions and costs.
  • Such a construction is possible in principle with discrete components. It is advantageous here that two different heat sinks of different performance can be used.
  • the heatsinks are practically thermally insulated from each other or decoupled by z. B. an air gap.
  • the fast-switching switches are designed as SiC components. If the commutation circuit consists only or partially of the fast-switching SiC components with a very high temperature resistance, this means that the fast-switching commutation circuit may, in principle, be heated more strongly than the slow-switching region. By short switching times but also very high clock frequencies are achievable. As a result, a considerable improvement in efficiency is possible.
  • the slow-switching switches are expediently designed as Si components, for example as MOSFET or IGBT switches. These switches are sufficient because they are clocked at a relatively low frequency, namely the line frequency. These have proven very successful with photovoltaic inverters.
  • a switch combination of MOSFET or IGBT switches with SiC JFETs is optimal for asymmetric clocking.
  • a decoupling switch is connected, which is clocked synchronously with the fast switching switches. This decoupling reduces high-frequency currents that are detrimental to photovoltaic modules due to their capacitance to earth.
  • decoupling switches in particular two decoupling switches, may be present within the bridge.
  • the decoupling switches are advantageously SiC components, in particular SiC FETs, because they are driven at the same clock frequency as the fast-switching switches of the bridge.
  • fast freewheeling diodes it is also advantageous to connect fast freewheeling diodes to the slow switches or the MOSFETs or IGBTs, which are, however, spatially associated with the fast-switching switches or the SiC switches.
  • free-wheeling diodes designed as Schottky diodes are therefore connected in parallel to the slow switches. During the freewheeling phases, which occur at high frequency, a fast switching of the diodes has a favorable effect on the efficiency.
  • the inverter is advantageously designed as a multi-level inverter, in particular as a three-level inverter.
  • an embodiment as a photovoltaic inverter.
  • the efficiency of a power plant is very important.
  • EMC Electromagnetic Compatibility
  • capacitive leakage currents of the photovoltaic modules and a compact design play a significant role in the marketability of the products.
  • the invention significantly improves a photovoltaic inverter.
  • In the further optimization of such inverters are an increase in efficiency and a reduction in manufacturing costs in the foreground.
  • Fig. 1 shows a full bridge for feeding into an AC voltage network N, preferably the power grid from a DC source or a DC voltage source, in particular from a photovoltaic generator PVG.
  • the generator PVG feeds the full bridge consisting of four switches S1, S2, S3 and S4. These switches are semiconductor switches, with two first, upper switches S1, S2 and two second, lower switches present.
  • the term "upper and lower switch” is only for ease of explanation.
  • the switches S3, S4 can also be connected at the top, ie at the positive pole.
  • the circuit is shown single-phase, but it can also be designed in three phases with six switches, so three upper and three lower switch.
  • a capacitor Cz is connected as a buffer.
  • the circuit comprises two line reactors LAC1 and LAC2.
  • the circuit is single-phase.
  • the bridge is clocked asymmetrically.
  • the first or upper switches S1, S2 are clocked at mains frequency, that is, at a different frequency than the second or lower switches S3, S4, which are clocked at a high frequency of, in particular, at least or more than 1 kHz, preferably more than 5 kHz ,
  • the upper switch S1, a diode D1 and the upper switch S2, a diode D2 is connected in anti-parallel.
  • the switch S1 is closed and the switch S4 is clocked high frequency.
  • the lower switch S4 is closed, a current flows via an upper switch S1 and the lower switch S4 and via the line reactors LAC1 and LAC2 into the alternating current network N, in particular into a power grid. This can also be an island network.
  • the switch S4 is open, a freewheeling circuit is formed. The current flows via the upper switch S1, the diode D2 and the two line reactors LAC1 and LAC2 into the power grid.
  • the other upper switch S2 is closed, wherein the lower switch S3 is clocked high frequency. If the lower switch S3 is closed, a current flows via the upper switch S2 and this switch S3 and the two line reactors LAC1 and LAC2 into the power grid. It creates a freewheeling circuit when the lower switch S3 is open. This is formed by the upper switch S2, the diode D1 and the chokes LAC1, LAC2 and the network N. An analog freewheeling circuit thus arises when the other lower switch S4 is open.
  • the arrangement after Fig. 1 includes at least partially fast switching devices, such as semiconductor switches and diodes, in particular SiC-JFET.
  • the second and lower switches S3 and S4 are designed as fast-switching switches, for example, self-conducting SiC-JFET.
  • upper switches S1 and S2 conventional switches, for example MOSFETs or silicon IGBTs, are used.
  • the upper switches S1 and S2 are IGBTs.
  • particularly fast-switching diodes for example SiC Schottky diodes, for the freewheeling diodes D1 and D2. This is a particularly high efficiency achievable.
  • the fast-switching switches S3, S4, ie the SiC components are spatially separated from the Si components or the slow switches S1, S2.
  • the SiC switches S3, S4 can be operated, for example, at much higher temperatures.
  • the lower switches S3, S4 and the diodes D1 and D2 are fast switching and high temperature resistant.
  • the fast switching switches S3, S4 are arranged spatially separated from the slow-switching switch S1, S2.
  • the slow-switching switches S1, S2 are arranged in particular in a first group of components, while the fast-switching switches S3, S4 are arranged spatially in a second group of components.
  • Fig. 2 shows how the components are to be arranged spatially.
  • the arrangement largely corresponds to the circuit Fig. 1 .
  • the high-frequency clocked commutation circuits consisting on the one hand of the diode D1 and the lower switch S3 and on the other hand, the diode D2 and the other lower switch S4, form a group of components.
  • the power-frequency clocked switches S1 and S2 form a second component group (see dashed line).
  • a backup capacitor Cs is additionally connected, close to the fast switch S3, S4.
  • the backup capacitor Cs prevents the voltages on the semiconductor switches from being able to build up to high values due to the parasitic inductances.
  • Each connection in the illustrated topology may be assigned a parasitic inductance Ls. The shorter these connections, the smaller the parasitic inductance Ls.
  • the components are additionally claimed.
  • the additional induced voltage Us is higher, the faster the switches switch, that is, the higher the current increase di / dt. Therefore, it is important to keep the parasitic inductances as low as possible for fast switching switches.
  • the switches are clocked asymmetrically, high-frequency on one pole.
  • the unipolar clocking creates a commutation circuit which is closed only via the rapidly switching components, namely the diode D1 and the lower switch S3 or the diode D2 and the other lower switch S4, and therefore not spatially connected to the slow-switching switch S1 or S2 must be coupled.
  • a spatial separation of fast and slow switching devices can be achieved in different ways, for example by discrete components on different heat sinks and / or within a semiconductor module.
  • a combination of discrete components and semiconductor modules is also possible. It can e.g. discrete switches S1, S2 and semiconductor module switches S3, S4 are used.
  • Fig. 3a and Fig. 3b show the structure of the circuit Fig. 1 respectively.
  • the component groups are advantageously arranged on different heat sinks K1, K2.
  • the fast switching switches S3, S4 and the diodes D1, D2 are thermally connected to the heat sink K1.
  • the slow-switching switches S1, S2 are connected to the heat sink K2.
  • the heat sink K1 of the fast-switching switches S3, S4 is, for example, larger than the heat sink K2 of the slow-switching switches S1, S2.
  • the heat sinks K1, K2 are arranged side by side.
  • About the mounted on the heat sinks K1, K2 switches and diodes is a board P with a Layout.
  • the connection pins AP of the switches and diodes are electrically connected to the tracks of the board P, for example, soldered.
  • FIGS. 3c to 3e show a housing G and the layout for two substrates SU1, SU2 a mounting module, in particular a semiconductor module H.
  • the slow switching switches S1 and S2 are soldered to the substrate SU1. From this substrate, the AC terminals WA1 and WA2 and the control terminals GS1 for the upper switch S1 and GS2 for the other upper switch S2 from.
  • the fast switching switches S3 and S4 are soldered to the substrate SU2. From this substrate, the DC terminals + and - as well as the control terminals GS3 for the lower switch S3 and GS4 for the other lower switch S4 from.
  • the backup capacitor Cs is also soldered.
  • Cs is here, for example, as an SMD component. Other embodiments are usable.
  • all switches S1 to S4 or all diodes D1 and D2 are designed as one chip each. Each switch or diode can also be implemented by a plurality of chips connected in parallel.
  • pins PIN are soldered to copper surfaces.
  • bonding wires can lead to pin terminals, for example, stuck in a plastic frame.
  • the substrates SU1, SU2 are soldered to a common bottom plate BP.
  • the plastic housing G is glued, which is provided with feedthroughs for the pins PIN and into which a further opening OE an insulating material is passed into the housing interior.
  • this is a soft potting.
  • a plastic frame can be placed on the bottom plate BP, in the connector pins PIN are plugged.
  • the module is filled with insulating material and a lid, e.g. closed by gluing.
  • Figure 4 shows an arrangement for feeding into a power supply network from a DC source, in particular a photovoltaic generator (PVG), with an additional decoupling switch S5.
  • the lower switches S3, S4 and the additional switch S5 and the diodes D1 and D2 are fast switching and high temperature resistant.
  • These components form the first group of components.
  • a first backup capacitor Cs2 is connected analogously to the previous example.
  • a second backup capacitor Cs1 is placed in parallel with the buffer capacitor Cz. However, the second backup capacitor Cs1 is smaller, in particular substantially smaller than the buffer capacitor Cz.
  • the second backup capacitor Cs1 is disposed in the first group of components near the switches S3, S4.
  • the backup capacitor Cs2 may also be parallel to the bridge branches, as in Fig. 2 is shown to be arranged.
  • the upper switches S1 and S2 in Fig. 4 are the slow-switching and less temperature-resistant switches and form the second group of components.
  • Fig. 1 shown circuit asymmetric.
  • Fig. 2 shown circuit asymmetric.
  • the fifth switch S5 in front of the bridge. This simultaneously switches high-frequency and synchronously with one of the lower switches S3 and S4.
  • FIG. 5a and 5b show an execution of in Fig. 4 shown topology with distributed on two heat sinks K1, K2 discrete switches.
  • the construction is almost identical to the one in Fig. 3a shown construction.
  • Unlike the execution in Fig. 3a is additionally arranged on the heat sink K1, the fifth switch S5.
  • FIGS. 5c to 5e show an execution of in Fig. 4 shown circuit topology in a mounting module, in particular a semiconductor module H with two substrates SU1, SU2.
  • the structure is almost identical to that in the FIGS. 3c to 3e shown construction.
  • the switch S5 is still arranged on the substrate SU2.
  • the module also has another terminal, namely a control terminal GS5 for the fifth switch S5.
  • This circuit is called H5 bridge.
  • the bottom plate BP is preferably made of metal.
  • Figure 6 shows a multi-level circuit, in particular a three-level circuit for single-phase feed into the power grid N with the DC source and the photovoltaic generator PVG.
  • the circuit consists of a shared intermediate circuit, that is, two capacitors Cz1 and Cz2 are connected in series. The center is grounded.
  • This bridge branch consists of four series-connected switches S1 to S4.
  • the switches S1, S2 are arranged on the inside and the switches S3, S4 on the outside.
  • the capacitor Cs1 is connected in parallel with the series circuit consisting of the switch S3 and the diode D1
  • the capacitor Cs2 is connected in parallel to the series circuit consisting of the switch S4 and the diode D2.
  • the switches also clock asymmetrically.
  • the switches S1 and S2 are driven at mains frequency.
  • the switch S1 is closed, the switch S3 clocks high frequency. If the switch S1 is closed, a current flows through the switches S3, S1 and the line choke LAC into the network N. If the switch S3 is opened, a current flows through the freewheeling circuit, with the components S1, D1 and ground.
  • the switch S2 is closed and the switch S4 clocks high frequency.
  • the freewheeling circuit is then formed via the components S2, D2 and ground.
  • FIGS. 7a and 7b show an execution of in Fig. 6 shown topology with distributed on two heat sinks K1 and K2 discrete switches.
  • FIGS. 7c to 7e show an execution of in Fig. 6 shown topology in a mounting module, preferably ine a semiconductor module H.
  • the module is constructed similar to that for the full bridge or the H5 bridge. There is a difference in the arrangement and the occupancy of the pin PIN, as the figures show.
  • this module is constructed with two substrates SU1 and SU2.
  • the substrate SU1 comprises the slow-switching switches S1, S2 with low temperature resistance.
  • the substrate SU2 the fast switching switches S3, S4 with high temperature resistance.
  • the grounding points GND of the substrates SU1 and SU2 can be internally connected by bonds. Since this can be done optionally, this connection is shown in dashed lines. If several of these modules are connected in parallel, they can be fed into several phases. Each switch is in Fig. 7e represented by a chip. A parallel connection of several chips to increase the current carrying capacity is possible.
  • first switches S1, S2 of the same temperature resistance are used, and faster switches S3, S4 with steeper switching edges and higher temperature resistance are used for the higher clock frequency, wherein the first switches S1, S2 are referred to here by way of example as upper switches , of the second switch S3, S4, referred to here by way of example as upper switch, are arranged spatially separated.
  • circuits can after Fig. 4 or Fig. 6 also be three-phase.
  • Other bridge circuits with a different switch arrangement and / or a different number of switches and / or other freewheeling diodes can be combined with the invention.
  • the circuits are preferably transformerless. Solutions with a transformer are also possible. Also, boost and / or buck converters, MPP controllers, pulse width controllers, and other common methods can be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Claims (14)

  1. Onduleur destiné à injecter une puissance d'une source de tension continue, notamment d'un générateur photovoltaïque (PVG) dans un réseau de tension alternative (N), comprenant un circuit en pont à cadencement asymétrique pourvu d'au moins deux premiers commutateurs (S1, S2) cadencés à la fréquence du réseau et pourvu d'au moins deux deuxièmes commutateurs (S3, S4) cadencés à une fréquence d'horloge plus élevée, caractérisé en ce que
    des commutateurs à commutation lente (S1, S2) ayant la même résistance à la température sont utilisés pour la fréquence du réseau, en ce que des commutateurs à commutation rapide (S3, S4) ayant des fronts de commutation plus raides et une résistance à la température supérieure sont utilisés pour la fréquence d'horloge plus élevée, les commutateurs à commutation rapide (S3, S4) étant disposés séparés dans l'espace des commutateurs à commutation lente (S1, S2), en ce qu'au moins un condensateur de maintien (Cs) supplémentaire est raccordé à proximité des commutateurs à commutation rapide (S3, S4), en ce que les commutateurs à commutation lente (S1, S2) sont disposés dans un premier groupe de composants, alors que les commutateurs à commutation rapide (S3, S4) sont disposés dans un deuxième groupe de composants séparé dans l'espace, et en ce que le premier groupe de composants est disposé sur un premier substrat et le deuxième groupe de composants sur un deuxième substrat.
  2. Onduleur selon la revendication 1, caractérisé en ce qu'il existe respectivement des radiateurs (K1, K2) différents pour les commutateurs à commutation rapide (S3, S4) et les commutateurs à commutation lente (S1, S2), sur lesquels sont montés les commutateurs.
  3. Onduleur selon la revendication 1 ou 2, caractérisé en ce que les commutateurs sont intégrés dans au moins un ou plusieurs modules à semiconducteur (H).
  4. Onduleur selon la revendication 3, caractérisé en ce que les commutateurs S1 à S4 et des diodes D1 à D2 sont réalisés sous la forme de puces à l'intérieur d'un module (H).
  5. Onduleur selon l'une des revendications précédentes, caractérisé en ce que les commutateurs à commutation rapide (S3, S4) sont réalisés sous la forme de composants en SiC.
  6. Onduleur selon la revendication 5, caractérisé en ce que les commutateurs à commutation rapide (S3, S4) sont réalisés sous la forme de SiC-FET.
  7. Onduleur selon l'une des revendications précédentes, caractérisé en ce que les commutateurs à commutation lente (S1, S2) sont réalisés sous la forme de composants en Si.
  8. Onduleur selon la revendication 7, caractérisé en ce que les commutateurs à commutation lente (S1, S2) sont réalisés sous la forme de MOSFET ou d'IGBT.
  9. Onduleur selon l'une des revendications précédentes, caractérisé en ce qu'au moins un commutateur de découplage (S5) est raccordé, lequel est cadencé de manière synchrone avec les commutateurs à commutation rapide (S3, S4).
  10. Onduleur selon la revendication 9, caractérisé en ce que le commutateur de découplage (S5) est raccordé entre la source de tension continue et le circuit en pont.
  11. Onduleur selon la revendication 9 ou 10, caractérisé en ce que le ou les commutateurs de découplage (S5) sont réalisés sous la forme de composants en SiC, notamment de SiC-FET.
  12. Onduleur selon l'une des revendications précédentes, caractérisé en ce que des diodes de roue libre (D1, D2) sont branchées en parallèle avec les commutateurs à commutation lente (S1, S2), notamment en ce que les diodes de roue libre sont réalisées sous la forme de diodes Schottky et/ou en ce que les diodes de roue libre sont associées dans l'espace aux commutateurs à commutation rapide (S3, S4).
  13. Onduleur selon l'une des revendications précédentes, caractérisé par une exécution sous la forme d'un onduleur multiniveaux, notamment d'un onduleur à trois niveaux.
  14. Onduleur selon l'une des revendications précédentes, caractérisé par une exécution sous la forme d'un onduleur photovoltaïque.
EP08011019.0A 2008-06-18 2008-06-18 Onduleur realisé par un pont comportant des commutateurs synchronisant lentement et rapidement Active EP2136465B1 (fr)

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US12/477,948 US8094475B2 (en) 2008-06-18 2009-06-04 Inverter with asymmetric clocking and thermally isolated modules
KR1020090052647A KR101123431B1 (ko) 2008-06-18 2009-06-15 인버터

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EP2136465A1 (fr) 2009-12-23
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US8094475B2 (en) 2012-01-10
KR20090131645A (ko) 2009-12-29

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